Respostas

2013-07-04T16:44:27-03:00
A*4^2-4*4-16=0

16a-16-16=0   16a=32  a=2

confere?
1 2 1
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2013-07-04T18:47:40-03:00
X=4
a(4)²-4(4)-16=0
a(16)-16-16=0
16a=32
a=2
1 5 1